That prop likes about 2,800 RPM with a torque making engine. The prop manufacturer rates it for 2,800 max. On the other hand, a direct drive 350 needs to turn all she can. I would not run a new one over 3,000 and given the age I suggest you dial it in at 2,800 and get what you get.
The prop itself is pretty wide for a DD 350 and at 72" you are running a lot of prop, too much without specific engine work. The more ideal prop for that setup would be 66-68" diameter, which will spin up quicker and can run a bit more RPM to make the engine happier.